implement an entire base refacotr and alot of styling overhauls and remakes.

src/config.js

@@ -0,0 +1,46 @@
+import path from "path";
+
+const bool = (value, fallback = false) => {
+    if (value == null || value === "") return fallback;
+    return ["1", "true", "yes", "on"].includes(String(value).toLowerCase());
+};
+
+const int = (value, fallback) => {
+    const parsed = Number.parseInt(value, 10);
+    return Number.isInteger(parsed) ? parsed : fallback;
+};
+
+export function createConfig(overrides = {}) {
+    const rootDir = overrides.rootDir || process.cwd();
+    const dataDir = overrides.dataDir || path.resolve(rootDir, "data");
+    const sessionsDir = overrides.sessionsDir || path.resolve(rootDir, "sessions");
+
+    const config = {
+        rootDir,
+        publicDir: path.resolve(rootDir, "public"),
+        dataDir,
+        sessionsDir,
+        port: int(process.env.PORT, 3000),
+        dbPath: process.env.DB_PATH || path.resolve(dataDir, "app.db"),
+        sessionSecret: process.env.SESSION_SECRET || "change-me-session-secret",
+        cookieSecure: bool(process.env.COOKIE_SECURE, false),
+        sessionMaxAgeMs: int(process.env.SESSION_MAX_AGE_MS, 7 * 24 * 60 * 60 * 1000),
+        chatLimit: int(process.env.CHAT_LIMIT, 10),
+        chatHistoryLimit: int(process.env.CHAT_HISTORY_LIMIT, 20),
+        modelApiBaseUrl: process.env.MODEL_API_BASE_URL || "https://ai.krishd.ch/api",
+        modelRequestTimeoutMs: int(process.env.MODEL_REQUEST_TIMEOUT_MS, 15000),
+        modelListTimeoutMs: int(process.env.MODEL_LIST_TIMEOUT_MS, 4000),
+        modelUnloadAfterMs: int(process.env.MODEL_UNLOAD_AFTER_MS, 30 * 1000),
+        modelsCacheTtlMs: int(process.env.MODELS_CACHE_TTL_MS, 5 * 60 * 1000),
+        authRateLimitWindowMs: int(process.env.AUTH_RATE_LIMIT_WINDOW_MS, 15 * 60 * 1000),
+        authRateLimitMaxPerIp: int(process.env.AUTH_RATE_LIMIT_MAX_PER_IP, 20),
+        authRateLimitMaxPerAccount: int(process.env.AUTH_RATE_LIMIT_MAX_PER_ACCOUNT, 10),
+        chatRateLimitWindowMs: int(process.env.CHAT_RATE_LIMIT_WINDOW_MS, 60 * 1000),
+        chatRateLimitMaxPerIp: int(process.env.CHAT_RATE_LIMIT_MAX_PER_IP, 60),
+        chatRateLimitMaxPerAccount: int(process.env.CHAT_RATE_LIMIT_MAX_PER_ACCOUNT, 30),
+        testMode: bool(process.env.TEST_MODE, process.env.NODE_ENV === "test"),
+        dropLegacyChats: bool(process.env.DROP_LEGACY_CHATS, true)
+    };
+
+    return {...config, ...overrides};
+}